Good move.
We put that into our advanced directives as well.
Ventilators are lifesavers for many pneumonias and for some cardiac scenarios (e.g., acute pulmonary edema). Do NOT put "do not intubate" into your advanced directives unless you really know what you are talking about (or are chronically ill and/or 80+ and do not want any aggressive care no matter what). Anyone who knows medicine will tell yout that this is an arbitrary distinction. If you have an easily-treatable community-acquired pneumonia or flash pulmonary edema (for example), you can be on a "vent" for a few days and bounce back 100%. If you are on a "vent" for ARDS from COVID, that's in it for the long haul. Many get better -- and many have permanent lung injury but not from being ventilated. OTOH, many patients with COVID who are not intubated/ventilated or even are not hospitalized have life-long lung injury.